Handling failures when synchronizing objects during a write operation

ABSTRACT

A method for execution by a dispersed storage network (DSN). The method begins by obtaining a data object for synchronized storage within a plurality of storage vaults, identifying a plurality of storage vaults, encoding the data object for each storage vault, initiating storage of data slices for each storage vault and interpreting received data slice information from at least some of the storage vaults to determine a number of storage vaults that have successfully stored the corresponding plurality of sets of encoded data slices and when the vault threshold number of storage vaults have not successfully stored the corresponding plurality of sets of encoded data slices within a synchronization timeframe, initiating a rollback process to abandon storage of the data object in the plurality of storage vaults and a store data response to indicate unsuccessful synchronized storage of the data object in the plurality of storage vaults.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present U.S. Utility Patent Application claims priority pursuant to 35 U.S.C. § 120, as a continuation-in-part (CIP) of U.S. Utility patent application Ser. No. 15/661,332, entitled “SYNCHRONOUSLY STORING DATA IN A PLURALITY OF DISPERSED STORAGE NETWORKS,” filed Jul. 27, 2017, which claims priority as a continuation-in-part (CIP) of U.S. Utility patent application Ser. No. 14/927,446, entitled “SYNCHRONIZING STORAGE OF DATA COPIES IN A DISPERSED STORAGE NETWORK,” filed Oct. 29, 2015, now U.S. Pat. No. 9,727,427, issued on Aug. 8, 2017, which claims priority pursuant to 35 U.S.C. § 119(e) to U.S. Provisional Application No. 62/098,449, entitled “SYNCHRONOUSLY STORING DATA IN A PLURALITY OF DISPERSED STORAGE NETWORKS,” filed Dec. 31, 2014, all of which are hereby incorporated herein by reference in their entirety and made part of the present U.S. Utility Patent Application for all purposes.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION Technical Field of the Invention

This invention relates generally to computer networks and more particularly to dispersing error encoded data.

Description of Related Art

Computing devices are known to communicate data, process data, and/or store data. Such computing devices range from wireless smart phones, laptops, tablets, personal computers (PC), work stations, and video game devices, to data centers that support millions of web searches, stock trades, or on-line purchases every day. In general, a computing device includes a central processing unit (CPU), a memory system, user input/output interfaces, peripheral device interfaces, and an interconnecting bus structure.

As is further known, a computer may effectively extend its CPU by using “cloud computing” to perform one or more computing functions (e.g., a service, an application, an algorithm, an arithmetic logic function, etc.) on behalf of the computer. Further, for large services, applications, and/or functions, cloud computing may be performed by multiple cloud computing resources in a distributed manner to improve the response time for completion of the service, application, and/or function. For example, Hadoop is an open source software framework that supports distributed applications enabling application execution by thousands of computers.

In addition to cloud computing, a computer may use “cloud storage” as part of its memory system. As is known, cloud storage enables a user, via its computer, to store files, applications, etc. on an Internet storage system. The Internet storage system may include a RAID (redundant array of independent disks) system and/or a dispersed storage system that uses an error correction scheme to encode data for storage.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

FIG. 1 is a schematic block diagram of an embodiment of a dispersed or distributed storage network (DSN) in accordance with the present invention;

FIG. 2 is a schematic block diagram of an embodiment of a computing core in accordance with the present invention;

FIG. 3 is a schematic block diagram of an example of dispersed storage error encoding of data in accordance with the present invention;

FIG. 4 is a schematic block diagram of a generic example of an error encoding function in accordance with the present invention;

FIG. 5 is a schematic block diagram of a specific example of an error encoding function in accordance with the present invention;

FIG. 6 is a schematic block diagram of an example of a slice name of an encoded data slice (EDS) in accordance with the present invention;

FIG. 7 is a schematic block diagram of an example of dispersed storage error decoding of data in accordance with the present invention;

FIG. 8 is a schematic block diagram of a generic example of an error decoding function in accordance with the present invention;

FIG. 9 is a schematic block diagram of another dispersed storage network (DSN) that includes a plurality of storage vaults in accordance with the present invention; and

FIG. 9A is a flowchart illustrating another example of synchronizing storage of new data in a plurality of storage vaults.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a schematic block diagram of an embodiment of a dispersed, or distributed, storage network (DSN) 10 that includes a plurality of computing devices 12-16, a managing unit 18, an integrity processing unit 20, and a DSN memory 22. The components of the DSN 10 are coupled to a network 24, which may include one or more wireless and/or wire lined communication systems; one or more non-public intranet systems and/or public internet systems; and/or one or more local area networks (LAN) and/or wide area networks (WAN).

The DSN memory 22 includes a plurality of storage units 36 that may be located at geographically different sites (e.g., one in Chicago, one in Milwaukee, etc.), at a common site, or a combination thereof. For example, if the DSN memory 22 includes eight storage units 36, each storage unit is located at a different site. As another example, if the DSN memory 22 includes eight storage units 36, all eight storage units are located at the same site. As yet another example, if the DSN memory 22 includes eight storage units 36, a first pair of storage units are at a first common site, a second pair of storage units are at a second common site, a third pair of storage units are at a third common site, and a fourth pair of storage units are at a fourth common site. Note that a DSN memory 22 may include more or less than eight storage units 36. Further note that each storage unit 36 includes a computing core (as shown in FIG. 2 , or components thereof) and a plurality of memory devices for storing dispersed error encoded data.

Each of the computing devices 12-16, the managing unit 18, and the integrity processing unit 20 include a computing core 26, which includes network interfaces 30-33. Computing devices 12-16 may each be a portable computing device and/or a fixed computing device. A portable computing device may be a social networking device, a gaming device, a cell phone, a smart phone, a digital assistant, a digital music player, a digital video player, a laptop computer, a handheld computer, a tablet, a video game controller, and/or any other portable device that includes a computing core. A fixed computing device may be a computer (PC), a computer server, a cable set-top box, a satellite receiver, a television set, a printer, a fax machine, home entertainment equipment, a video game console, and/or any type of home or office computing equipment. Note that each of the managing unit 18 and the integrity processing unit 20 may be separate computing devices, may be a common computing device, and/or may be integrated into one or more of the computing devices 12-16 and/or into one or more of the storage units 36.

Each interface 30, 32, and 33 includes software and hardware to support one or more communication links via the network 24 indirectly and/or directly. For example, interface 30 supports a communication link (e.g., wired, wireless, direct, via a LAN, via the network 24, etc.) between computing devices 14 and 16. As another example, interface 32 supports communication links (e.g., a wired connection, a wireless connection, a LAN connection, and/or any other type of connection to/from the network 24) between computing devices 12 & 16 and the DSN memory 22. As yet another example, interface 33 supports a communication link for each of the managing unit 18 and the integrity processing unit 20 to the network 24.

Computing devices 12 and 16 include a dispersed storage (DS) client module 34, which enables the computing device to dispersed storage error encode and decode data as subsequently described with reference to one or more of FIGS. 3-9A. In this example embodiment, computing device 16 functions as a dispersed storage processing agent for computing device 14. In this role, computing device 16 dispersed storage error encodes and decodes data on behalf of computing device 14. With the use of dispersed storage error encoding and decoding, the DSN 10 is tolerant of a significant number of storage unit failures (the number of failures is based on parameters of the dispersed storage error encoding function) without loss of data and without the need for a redundant or backup copies of the data. Further, the DSN 10 stores data for an indefinite period of time without data loss and in a secure manner (e.g., the system is very resistant to unauthorized attempts at accessing the data).

In operation, the managing unit 18 performs DS management services. For example, the managing unit 18 establishes distributed data storage parameters (e.g., vault creation, distributed storage parameters, security parameters, billing information, user profile information, etc.) for computing devices 12-14 individually or as part of a group of user devices. As a specific example, the managing unit 18 coordinates creation of a vault (e.g., a virtual memory block associated with a portion of an overall namespace of the DSN) within the DSTN memory 22 for a user device, a group of devices, or for public access and establishes per vault dispersed storage (DS) error encoding parameters for a vault. The managing unit 18 facilitates storage of DS error encoding parameters for each vault by updating registry information of the DSN 10, where the registry information may be stored in the DSN memory 22, a computing device 12-16, the managing unit 18, and/or the integrity processing unit 20.

The DSN managing unit 18 creates and stores user profile information (e.g., an access control list (ACL)) in local memory and/or within memory of the DSN memory 22. The user profile information includes authentication information, permissions, and/or the security parameters. The security parameters may include encryption/decryption scheme, one or more encryption keys, key generation scheme, and/or data encoding/decoding scheme.

The DSN managing unit 18 creates billing information for a particular user, a user group, a vault access, public vault access, etc. For instance, the DSTN managing unit 18 tracks the number of times a user accesses a non-public vault and/or public vaults, which can be used to generate per-access billing information. In another instance, the DSTN managing unit 18 tracks the amount of data stored and/or retrieved by a user device and/or a user group, which can be used to generate per-data-amount billing information.

As another example, the managing unit 18 performs network operations, network administration, and/or network maintenance. Network operations includes authenticating user data allocation requests (e.g., read and/or write requests), managing creation of vaults, establishing authentication credentials for user devices, adding/deleting components (e.g., user devices, storage units, and/or computing devices with a DS client module 34) to/from the DSN 10, and/or establishing authentication credentials for the storage units 36. Network administration includes monitoring devices and/or units for failures, maintaining vault information, determining device and/or unit activation status, determining device and/or unit loading, and/or determining any other system level operation that affects the performance level of the DSN 10. Network maintenance includes facilitating replacing, upgrading, repairing, and/or expanding a device and/or unit of the DSN 10.

The integrity processing unit 20 performs rebuilding of ‘bad’ or missing encoded data slices. At a high level, the integrity processing unit 20 performs rebuilding by periodically attempting to retrieve/list encoded data slices, and/or slice names of the encoded data slices, from the DSN memory 22. For retrieved encoded slices, they are checked for errors due to data corruption, outdated version, etc. If a slice includes an error, it is flagged as a ‘bad’ slice. For encoded data slices that were not received and/or not listed, they are flagged as missing slices. Bad and/or missing slices are subsequently rebuilt using other retrieved encoded data slices that are deemed to be good slices to produce rebuilt slices. The rebuilt slices are stored in the DSTN memory 22.

FIG. 2 is a schematic block diagram of an embodiment of a computing core 26 that includes a processing module 50, a memory controller 52, main memory 54, a video graphics processing unit 55, an input/output (IO) controller 56, a peripheral component interconnect (PCI) interface 58, an IO interface module 60, at least one IO device interface module 62, a read only memory (ROM) basic input output system (BIOS) 64, and one or more memory interface modules. The one or more memory interface module(s) includes one or more of a universal serial bus (USB) interface module 66, a host bus adapter (HBA) interface module 68, a network interface module 70, a flash interface module 72, a hard drive interface module 74, and a DSN interface module 76.

The DSN interface module 76 functions to mimic a conventional operating system (OS) file system interface (e.g., network file system (NFS), flash file system (FFS), disk file system (DFS), file transfer protocol (FTP), web-based distributed authoring and versioning (WebDAV), etc.) and/or a block memory interface (e.g., small computer system interface (SCSI), internet small computer system interface (iSCSI), etc.). The DSN interface module 76 and/or the network interface module 70 may function as one or more of the interface 30-33 of FIG. 1 . Note that the IO device interface module 62 and/or the memory interface modules 66-76 may be collectively or individually referred to as IO ports.

FIG. 3 is a schematic block diagram of an example of dispersed storage error encoding of data. When a computing device 12 or 16 has data to store it disperse storage error encodes the data in accordance with a dispersed storage error encoding process based on dispersed storage error encoding parameters. The dispersed storage error encoding parameters include an encoding function (e.g., information dispersal algorithm, Reed-Solomon, Cauchy Reed-Solomon, systematic encoding, non-systematic encoding, on-line codes, etc.), a data segmenting protocol (e.g., data segment size, fixed, variable, etc.), and per data segment encoding values. The per data segment encoding values include a total, or pillar width, number (T) of encoded data slices per encoding of a data segment i.e., in a set of encoded data slices); a decode threshold number (D) of encoded data slices of a set of encoded data slices that are needed to recover the data segment; a read threshold number (R) of encoded data slices to indicate a number of encoded data slices per set to be read from storage for decoding of the data segment; and/or a write threshold number (W) to indicate a number of encoded data slices per set that must be accurately stored before the encoded data segment is deemed to have been properly stored. The dispersed storage error encoding parameters may further include slicing information (e.g., the number of encoded data slices that will be created for each data segment) and/or slice security information (e.g., per encoded data slice encryption, compression, integrity checksum, etc.).

In the present example, Cauchy Reed-Solomon has been selected as the encoding function (a generic example is shown in FIG. 4 and a specific example is shown in FIG. 5 ); the data segmenting protocol is to divide the data object into fixed sized data segments; and the per data segment encoding values include: a pillar width of 5, a decode threshold of 3, a read threshold of 4, and a write threshold of 4. In accordance with the data segmenting protocol, the computing device 12 or 16 divides the data (e.g., a file (e.g., text, video, audio, etc.), a data object, or other data arrangement) into a plurality of fixed sized data segments (e.g., 1 through Y of a fixed size in range of Kilo-bytes to Tera-bytes or more). The number of data segments created is dependent of the size of the data and the data segmenting protocol.

The computing device 12 or 16 then disperse storage error encodes a data segment using the selected encoding function (e.g., Cauchy Reed-Solomon) to produce a set of encoded data slices. FIG. 4 illustrates a generic Cauchy Reed-Solomon encoding function, which includes an encoding matrix (EM), a data matrix (DM), and a coded matrix (CM). The size of the encoding matrix (EM) is dependent on the pillar width number (T) and the decode threshold number (D) of selected per data segment encoding values. To produce the data matrix (DM), the data segment is divided into a plurality of data blocks and the data blocks are arranged into D number of rows with Z data blocks per row. Note that Z is a function of the number of data blocks created from the data segment and the decode threshold number (D). The coded matrix is produced by matrix multiplying the data matrix by the encoding matrix.

FIG. 5 illustrates a specific example of Cauchy Reed-Solomon encoding with a pillar number (T) of five and decode threshold number of three. In this example, a first data segment is divided into twelve data blocks (D1-D12). The coded matrix includes five rows of coded data blocks, where the first row of X11-X14 corresponds to a first encoded data slice (EDS 1_1), the second row of X21-X24 corresponds to a second encoded data slice (EDS 2_1), the third row of X31-X34 corresponds to a third encoded data slice (EDS 3_1), the fourth row of X41-X44 corresponds to a fourth encoded data slice (EDS 4_1), and the fifth row of X51-X54 corresponds to a fifth encoded data slice (EDS 5_1). Note that the second number of the EDS designation corresponds to the data segment number.

Returning to the discussion of FIG. 3 , the computing device also creates a slice name (SN) for each encoded data slice (EDS) in the set of encoded data slices. A typical format for a slice name 60 is shown in FIG. 6 . As shown, the slice name (SN) 60 includes a pillar number of the encoded data slice (e.g., one of 1-T), a data segment number (e.g., one of 1-Y), a vault identifier (ID), a data object identifier (ID), and may further include revision level information of the encoded data slices. The slice name functions as, at least part of, a DSN address for the encoded data slice for storage and retrieval from the DSN memory 22.

As a result of encoding, the computing device 12 or 16 produces a plurality of sets of encoded data slices, which are provided with their respective slice names to the storage units for storage. As shown, the first set of encoded data slices includes EDS 1_1 through EDS 5_1 and the first set of slice names includes SN 1_1 through SN 5_1 and the last set of encoded data slices includes EDS 1_Y through EDS 5_Y and the last set of slice names includes SN 1_Y through SN 5_Y.

FIG. 7 is a schematic block diagram of an example of dispersed storage error decoding of a data object that was dispersed storage error encoded and stored in the example of FIG. 4 . In this example, the computing device 12 or 16 retrieves from the storage units at least the decode threshold number of encoded data slices per data segment. As a specific example, the computing device retrieves a read threshold number of encoded data slices.

To recover a data segment from a decode threshold number of encoded data slices, the computing device uses a decoding function as shown in FIG. 8 . As shown, the decoding function is essentially an inverse of the encoding function of FIG. 4 . The coded matrix includes a decode threshold number of rows (e.g., three in this example) and the decoding matrix in an inversion of the encoding matrix that includes the corresponding rows of the coded matrix. For example, if the coded matrix includes rows 1, 2, and 4, the encoding matrix is reduced to rows 1, 2, and 4, and then inverted to produce the decoding matrix.

In one embodiment, when a DS processing unit chooses to synchronize objects to N vaults during a write operation, the manner in which it handles and processes errors must be amended (as will be discussed in further detail in FIG. 9 and FIG. 9A descriptions below). Normally, when writing to a single vault, if an error is encountered that error will cause the operation to fail and the appropriate error message to be returned to the requester. However, in a configuration where the DS processing unit decides to distribute the write operation across some number of the N vaults, the manner in which errors are processed and handled becomes more nuanced. In the case where the DS processing unit is writing to two vaults simultaneously, if the threshold for writing to vaults is 1 and 1 error is encountered, the DS processing unit will suspend and optionally roll-back the operation to the vault which encountered the write error, while continuing to process the write operation to the other vault which has not yet failed. If the write operation succeeds on at least a threshold number of vaults, then the DS processing unit will return a success indicator to the requester (optionally indicating the number of vaults on which the operation was completed successfully).

If, however, a sufficient number of failures occur across the vaults that a threshold cannot be met, the DS processing unit will cancel and rollback all operations and return an error indicator to the requester. Since the types of errors may be unique or different, the DS processing unit may return an error response including each of the failures for each vault where an error was encountered. Or in other cases, where the DS processing unit is constrained to return only a single error indicator, it may select the one that is most specific, least general, or conveys the greatest amount of information.

FIG. 9 is a schematic block diagram of another dispersed storage network (DSN) that includes a plurality of storage vaults, the network 24 of FIG. 1 , and a distributed storage and task (DST) processing unit 16 (computing device) of FIG. 1 . The plurality of storage vaults may be implemented utilizing one or more sets of DST execution (EX) units. Each set of DST execution units may include any number of DST execution units. For example, vault 1 is implemented to include a first set of DST execution units 1-1 through 1-n, vault 2 is implemented to include a second set of DST execution units 2-1 through 2-n, etc. through vault V that is implemented to include a “Vth” set of DST execution units V-1 through V-n. Each DST execution unit may be implemented utilizing a DST execution unit (storage unit) 36 of DSN memory 22 as shown in FIG. 1 .

The DSN functions to synchronize storage of newly stored data in the plurality of storage vaults. In an example of operation of the synchronous storage of the data, the DST processing unit 16 receives a store data request 350 from a requesting entity. The store data request 350 includes one or more of a data object for storage, metadata of the data object including one or more of a data identifier a data size indicator, an identifier of the requesting entity, a data type indicator, a data owner identifier, or a synchronization level indicator. Having received the store data request 350, the DST processing unit 16 identifies the plurality of storage vaults for storage of the data object. The identifying may be based on one or more of the metadata of the data object, an interpretation of system registry information, a predetermination, or an interpretation of a request. For example, the DST processing unit 16 identifies the storage vaults 1-V based on the identifier of the requesting entity.

Having identified the plurality of storage vaults, for each storage vault of the plurality of storage vaults, the DST processing unit 16 generates a corresponding plurality of sets of encoded data slices 352 in accordance with dispersal parameters associated with the storage vault. As a specific example, the DST processing unit 16 obtains the dispersal parameters for the storage vault, and when, the dispersal parameters are unique, dispersed storage error encodes the data object to produce another plurality of sets of encoded data slices 352.

Having produced the encoded data slices 352, for each storage vault of the plurality of storage vaults, the DST processing unit 16 initiates storage of the corresponding plurality of sets of encoded data slices. As a specific example, the DST processing unit 16 issues, via the network 24, one or more sets of write slice requests to a set of DST execution units associated with the storage vault, where the one or more sets of write slice requests includes the corresponding plurality of sets of encoded data slices 352. Having sent the encoded data slices to the plurality of storage vaults for storage, the DST processing unit 16 receives, via the network 24, slice information 354 from at least some of the storage vaults. The slice information 354 includes one or more of a write slice response, a list slice request, a list slice response, a slice name, a slice revision number, a data object revision number, a slice revision number, a rollback write request, or a rollback write response.

Having received the slice information 354, the DST processing unit 16 interprets the received slice information 354 to determine how many storage vaults have successfully stored the corresponding plurality of sets of encoded data slices. As a specific example, for each storage vault slice information 354, the DST processing unit 16 determines whether the plurality of sets of encoded data slices 352 have been successfully stored in at least a write threshold number of DST execution units associated with the storage vault. For instance, the DST processing unit 16 interprets write slice responses indicating success or failure of storage operations.

When the vault threshold number of storage vaults have not yet successfully stored the corresponding plurality of sets of encoded data slices within a synchronization timeframe, the DST processing unit 16 initiates a rollback process to abandon storing the data object in the plurality of storage vaults. As a specific example, the DST processing unit 16 issues, via the network 24, rollback requests to each storage vault to facilitate deletion of the pluralities of sets of encoded data slices.

Having issued the rollback request, the DST processing unit 16 generates a store data response 356 to indicate unsuccessful synchronize storage of the data object in the plurality of storage vaults. As a specific example, the DST processing unit 16 generates the store data response 356 to include an indicator of which storage vaults were unsuccessful and to include a root cause indicator for the unsuccessful storage. For instance, if one error indicated unable_to_communicate, and another error indicated invalid_credentials, then the invalid_credentials error would be returned to the requesting entity, as it provides more specific information about the error condition and about how it might be resolved. As such, each error message may be given a “specificity score” which can be used to evaluate and determine which error indicator to be returned. Having generated the store data response, the DST processing unit 16 sends the store data response 356 to the requesting entity.

FIG. 9A is a flowchart illustrating another example of synchronizing storage of new data in a plurality of storage vaults. The method includes step 366 where a processing module (e.g., of a distributed storage and task (DST) processing unit) obtains a data object for synchronized storage within a plurality of storage vaults. The method continues in step 368, where a processing module identifies the plurality of storage vaults. The method continues in step 370, where a processing module encodes the data object for each storage vault to produce a corresponding plurality of sets of encoded data slices in accordance with dispersal parameters associated with the storage vault. The method continues in step 372, where a processing module initiates storage for each storage vault of the corresponding plurality of sets of encoded data slices. The method continues in step 374, where a processing module interprets received slice information from at least some of the storage vaults to determine a number of storage vaults that have successfully stored the corresponding plurality of sets of encoded data slices.

When the vault threshold number of storage vaults have not successfully stored the corresponding plurality of sets of encoded data slices within a synchronization timeframe, the method continues at step 386 where the processing module initiates a rollback process to abandon storage of the data object in the plurality of storage vaults. For example, the processing module issues rollback requests to each storage vault of a plurality of storage vaults to facilitate deletion of the corresponding plurality of sets of encoded data slices.

The method continues at step 388 where the processing module generates a store data response to indicate unsuccessful synchronized storage of the data object in the plurality of storage vaults. For example, the processing module identifies one or more storage vaults associated with the unsuccessful storage, and for each, identifies one or more read causes associated with the unsuccessful storage, generates the store data response to include the identities of the one or more storage vaults associated with the unsuccessful storage, and, for each storage vault, the identified one or more causes, and sends the store data response to a requesting entity.

The method described above in conjunction with the processing module can alternatively be performed by other modules of the dispersed storage network or by other computing devices. In addition, at least one memory section (e.g., a non-transitory computer readable storage medium) that stores operational instructions can, when executed by one or more processing modules of one or more computing devices of the dispersed storage network (DSN), cause the one or more computing devices to perform any or all of the method steps described above.

It is noted that terminologies as may be used herein such as bit stream, stream, signal sequence, etc. (or their equivalents) have been used interchangeably to describe digital information whose content corresponds to any of a number of desired types (e.g., data, video, speech, audio, etc. any of which may generally be referred to as ‘data’).

As may be used herein, the terms “substantially” and “approximately” provides an industry-accepted tolerance for its corresponding term and/or relativity between items. Such an industry-accepted tolerance ranges from less than one percent to fifty percent and corresponds to, but is not limited to, component values, integrated circuit process variations, temperature variations, rise and fall times, and/or thermal noise. Such relativity between items ranges from a difference of a few percent to magnitude differences. As may also be used herein, the term(s) “configured to”, “operably coupled to”, “coupled to”, and/or “coupling” includes direct coupling between items and/or indirect coupling between items via an intervening item (e.g., an item includes, but is not limited to, a component, an element, a circuit, and/or a module) where, for an example of indirect coupling, the intervening item does not modify the information of a signal but may adjust its current level, voltage level, and/or power level. As may further be used herein, inferred coupling (i.e., where one element is coupled to another element by inference) includes direct and indirect coupling between two items in the same manner as “coupled to”. As may even further be used herein, the term “configured to”, “operable to”, “coupled to”, or “operably coupled to” indicates that an item includes one or more of power connections, input(s), output(s), etc., to perform, when activated, one or more its corresponding functions and may further include inferred coupling to one or more other items. As may still further be used herein, the term “associated with”, includes direct and/or indirect coupling of separate items and/or one item being embedded within another item.

As may be used herein, the term “compares favorably”, indicates that a comparison between two or more items, signals, etc., provides a desired relationship. For example, when the desired relationship is that signal 1 has a greater magnitude than signal 2, a favorable comparison may be achieved when the magnitude of signal 1 is greater than that of signal 2 or when the magnitude of signal 2 is less than that of signal 1. As may be used herein, the term “compares unfavorably”, indicates that a comparison between two or more items, signals, etc., fails to provide the desired relationship.

As may also be used herein, the terms “processing module”, “processing circuit”, “processor”, and/or “processing unit” may be a single processing device or a plurality of processing devices. Such a processing device may be a microprocessor, micro-controller, digital signal processor, microcomputer, central processing unit, field programmable gate array, programmable logic device, state machine, logic circuitry, analog circuitry, digital circuitry, and/or any device that manipulates signals (analog and/or digital) based on hard coding of the circuitry and/or operational instructions. The processing module, module, processing circuit, and/or processing unit may be, or further include, memory and/or an integrated memory element, which may be a single memory device, a plurality of memory devices, and/or embedded circuitry of another processing module, module, processing circuit, and/or processing unit. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. Note that if the processing module, module, processing circuit, and/or processing unit includes more than one processing device, the processing devices may be centrally located (e.g., directly coupled together via a wired and/or wireless bus structure) or may be distributedly located (e.g., cloud computing via indirect coupling via a local area network and/or a wide area network). Further note that if the processing module, module, processing circuit, and/or processing unit implements one or more of its functions via a state machine, analog circuitry, digital circuitry, and/or logic circuitry, the memory and/or memory element storing the corresponding operational instructions may be embedded within, or external to, the circuitry comprising the state machine, analog circuitry, digital circuitry, and/or logic circuitry. Still further note that, the memory element may store, and the processing module, module, processing circuit, and/or processing unit executes, hard coded and/or operational instructions corresponding to at least some of the steps and/or functions illustrated in one or more of the Figures. Such a memory device or memory element can be included in an article of manufacture.

One or more embodiments have been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claims. Further, the boundaries of these functional building blocks have been arbitrarily defined for convenience of description. Alternate boundaries could be defined as long as the certain significant functions are appropriately performed. Similarly, flow diagram blocks may also have been arbitrarily defined herein to illustrate certain significant functionality.

To the extent used, the flow diagram block boundaries and sequence could have been defined otherwise and still perform the certain significant functionality. Such alternate definitions of both functional building blocks and flow diagram blocks and sequences are thus within the scope and spirit of the claims. One of average skill in the art will also recognize that the functional building blocks, and other illustrative blocks, modules and components herein, can be implemented as illustrated or by discrete components, application specific integrated circuits, processors executing appropriate software and the like or any combination thereof.

In addition, a flow diagram may include a “start” and/or “continue” indication. The “start” and “continue” indications reflect that the steps presented can optionally be incorporated in or otherwise used in conjunction with other routines. In this context, “start” indicates the beginning of the first step presented and may be preceded by other activities not specifically shown. Further, the “continue” indication reflects that the steps presented may be performed multiple times and/or may be succeeded by other activities not specifically shown. Further, while a flow diagram indicates a particular ordering of steps, other orderings are likewise possible provided that the principles of causality are maintained.

The one or more embodiments are used herein to illustrate one or more aspects, one or more features, one or more concepts, and/or one or more examples. A physical embodiment of an apparatus, an article of manufacture, a machine, and/or of a process may include one or more of the aspects, features, concepts, examples, etc. described with reference to one or more of the embodiments discussed herein. Further, from figure to figure, the embodiments may incorporate the same or similarly named functions, steps, modules, etc. that may use the same or different reference numbers and, as such, the functions, steps, modules, etc. may be the same or similar functions, steps, modules, etc. or different ones.

Unless specifically stated to the contra, signals to, from, and/or between elements in a figure of any of the figures presented herein may be analog or digital, continuous time or discrete time, and single-ended or differential. For instance, if a signal path is shown as a single-ended path, it also represents a differential signal path. Similarly, if a signal path is shown as a differential path, it also represents a single-ended signal path. While one or more particular architectures are described herein, other architectures can likewise be implemented that use one or more data buses not expressly shown, direct connectivity between elements, and/or indirect coupling between other elements as recognized by one of average skill in the art.

The term “module” is used in the description of one or more of the embodiments. A module implements one or more functions via a device such as a processor or other processing device or other hardware that may include or operate in association with a memory that stores operational instructions. A module may operate independently and/or in conjunction with software and/or firmware. As also used herein, a module may contain one or more sub-modules, each of which may be one or more modules.

As may further be used herein, a computer readable memory includes one or more memory elements. A memory element may be a separate memory device, multiple memory devices, or a set of memory locations within a memory device. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. The memory device may be in a form a solid state memory, a hard drive memory, cloud memory, thumb drive, server memory, computing device memory, and/or other physical medium for storing digital information.

While particular combinations of various functions and features of the one or more embodiments have been expressly described herein, other combinations of these features and functions are likewise possible. The present disclosure is not limited by the particular examples disclosed herein and expressly incorporates these other combinations. 

What is claimed is:
 1. A method for execution by one or more processing modules of one or more computing devices of a distributed storage network (DSN), the method comprises: obtaining a data object for synchronized storage within a plurality of storage vaults, wherein each of the plurality of storage vaults includes a set of storage units; identifying the plurality of storage vaults; encoding the data object for each storage vault of the plurality of storage vaults to produce a corresponding plurality of sets of encoded data slices in accordance with dispersal parameters associated with the storage vault; initiating storage for each storage vault of the corresponding plurality of sets of encoded data slices, wherein the initiating storage includes initiating storage to two or more vaults; interpreting received slice information from at least some of the storage vaults to determine a number of storage vaults that have successfully stored the corresponding plurality of sets of encoded data slices; when a vault threshold number of storage vaults have not successfully stored the corresponding plurality of sets of encoded data slices within a synchronization timeframe, initiating a rollback process to abandon storage of the data object in the plurality of storage vaults; and generating a store data response to indicate unsuccessful synchronized storage of the data object in the plurality of storage vaults.
 2. The method of claim 1, wherein the initiating a rollback process includes issuing rollback requests to each storage vault of the plurality of storage vaults to facilitate deletion of the corresponding plurality of sets of encoded data slices.
 3. The method of claim 1, wherein the store data response includes identities of one or more storage vaults associated with the unsuccessful synchronized storage.
 4. The method of claim 3, wherein, for each storage vault of the one or more storage vaults, the store data response includes one or more causes associated with the unsuccessful synchronized storage.
 5. The method of claim 1, wherein the obtaining includes a store data request including one or more of: a data object for storage, metadata of the data object including one or more of: a data identifier, a data size indicator, an identifier of a requesting entity, a data type indicator, a data owner identifier, or a synchronization level indicator.
 6. The method of claim 1, wherein the identifying the plurality of storage vaults is based on one or more of: the metadata of the data object, an interpretation of system registry information, a predetermination, or an interpretation of a request.
 7. The method of claim 1, wherein the identifying includes storage vaults based on an identifier of a requesting entity.
 8. The method of claim 1, wherein unique dispersal parameters encode the data object to produce another plurality of sets of encoded data slices.
 9. The method of claim 1, wherein the initiating storage of the corresponding plurality of sets of encoded data slices includes issuing one or more sets of write slice requests to a set of execution units associated with each of the storage vaults, where the one or more sets of write slice requests includes the corresponding plurality of sets of encoded data slices.
 10. The method of claim 1, wherein the corresponding plurality of sets of encoded data slices include slice information including one or more of: a write slice response, a list slice request, a list slice response, a slice name, a slice revision number, a data object revision number, a slice revision number, a rollback write request, or a rollback write response.
 11. The method of claim 10, wherein, for each storage vault slice information, a processing unit determines whether the plurality of sets of encoded data slices have been successfully stored in at least a write threshold number of execution units associated with each of the storage vaults.
 12. The method of claim 11, wherein the processing unit interprets write slice responses indicating success or failure of storage operations.
 13. The method of claim 1, wherein the generated store data response includes an indicator of which storage vaults were unsuccessful and includes a root cause indicator for the unsuccessful synchronized storage.
 14. The method of claim 13, wherein, when two or more indicators are received, a most specific indicator is returned to a requesting entity to provide more specific information about an error condition and about how it might be resolved.
 15. The method of claim 14, wherein each indicator, of the two or more indicators, includes a specificity score that can be used to evaluate and determine which error condition is to be returned.
 16. A computing device of a group of computing devices of a dispersed storage network (DSN), the computing device comprises: an interface; a local memory; and a processing module operably coupled to the interface and the local memory, wherein the processing module functions to: obtain a data object for synchronized storage within a plurality of storage vaults, wherein each of the plurality of storage vaults includes a set of storage units; identify the plurality of storage vaults; encode the data object for each storage vault to produce a corresponding plurality of sets of encoded data slices in accordance with dispersal parameters associated with the storage vault; initiate storage for each storage vault of the corresponding plurality of sets of encoded data slices, wherein the initiate storage includes initiating storage to two or more vaults; interpret received slice information from at least some of the storage vaults to determine a number of storage vaults that have successfully stored the corresponding plurality of sets of encoded data slices; and when a vault threshold number of storage vaults have not successfully stored the corresponding plurality of sets of encoded data slices within a synchronization timeframe, initiate a rollback process to abandon storage of the data object in the plurality of storage vaults; and generate a store data response to indicate unsuccessful synchronized storage of the data object in the plurality of storage vaults.
 17. The computing device of claim 16, wherein the initiate a rollback process includes issuing rollback requests to each storage vault of the plurality of storage vaults to facilitate deletion of the corresponding plurality of sets of encoded data slices.
 18. The computing device of claim 16, wherein the generated store data response includes an indicator of which storage vaults were unsuccessful and includes a root cause indicator for the unsuccessful synchronized storage.
 19. The computing device of claim 18, wherein, when two or more indicators are received, a most specific indicator is returned to a requesting entity to provide more specific information about an error condition and about how it might be resolved.
 20. The computing device of claim 19, wherein each indicator, of the two or more indicators, includes a specificity score that can be used to evaluate and determine which error condition is to be returned. 